Credit Card Warmed For No Reason

Good da<br> <br> I have been a valued client of African Bank for the last three years. My credit card is always paid and not in arrears. I attempted to withdraw funds and the ATM advised me to call the bank. I have contacted African bank via the call centre number and they have advised me that my card has been blocked and will only be unblocked when I have a debit order on the account. Why must I have a debit order when I do the monthly payment myself. If this is not corrected today, I will log a complaint with the relevant ombudsman.